<template>
    <el-breadcrumb class="app-breadcrumb" separator="/">
        <transition-group name="breadcrumb">
            <el-breadcrumb-item v-for="(item,index) in levelList" :key="item.path">
                <span v-if="item.redirect==='noRedirect'||index==levelList.length-1"
                      class="no-redirect">{{ item.meta.title }}</span>
                <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
            </el-breadcrumb-item>
        </transition-group>
    </el-breadcrumb>
</template>

<script lang="ts">
import pathToRegexp from 'path-to-regexp'
import {defineComponent, onMounted, ref,watch} from "vue";
import {RouteLocationMatched, useRoute, useRouter} from "vue-router";

export default defineComponent({
    setup() {
        const router = useRouter()
        const route: any = useRoute()
        const levelList = ref(null)
        const isDashboard = (route: any) => {
            const name: string = route && route.name
            if (!name) {
                return false
            }
            return name.trim().toLocaleLowerCase() === 'Dashboard'.toLocaleLowerCase()
        }
        const getBreadcrumb = () => {
            let matched: any = route.matched.filter((item: any) => item.meta && item.meta.title)
            const first: RouteLocationMatched = matched[0]
            if (!isDashboard(first)) {
                matched = [{path: '/dashboard', meta: {title: '首页'}}].concat(matched)
            }
            levelList.value = matched.filter((item: any) => item.meta && item.meta.title && item.meta.breadcrumb !== false)
        }
        const pathCompile = (path: string): any => {
            const {params}: any = route
            let toPath = pathToRegexp.compile(path)
            return toPath(params)
        }

        const handleLink = (item: any) => {
            const {redirect, path} = item
            if (redirect) {
                router.push(redirect)
                return
            }
            router.push(pathCompile(path))
        }
        onMounted(()=>{
            getBreadcrumb()
        })
        watch(route,()=>{
            getBreadcrumb()
        })

        return {
            levelList,
            isDashboard,
            getBreadcrumb,
            pathCompile,
            handleLink
        }

    }

})
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
    display: inline-block;
    font-size: 14px;
    line-height: 50px;
    margin-left: 8px;

    .no-redirect {
        color: #97a8be;
        cursor: text;
    }
}
</style>
